Fragment+RadioButton实现点击切换页面效果

水深无声 2023-10-17 13:02 149阅读 0赞

`首先，我们需要在主布局文件中activity_main.xml 放一个 容器，方便让fragment加入进去,底部导航栏使用RedioButton切换页面，每一个RadioButton都使用了选择器进行图片与字体的变化。`

`（下一篇+viewPage滑动）`

**四个相同选择器文件rabtn\_a\_selector.xml**

<?xml version="1.0" encoding="utf-8"?>
    <selector xmlns:android="http://schemas.android.com/apk/res/android">
        <item android:drawable="@drawable/c_0" android:state_checked="false" android:color="@color/gray"/>
        <item android:drawable="@drawable/c_1" android:state_checked="true" android:color="@color/bule"/>
    </selector>

**然后，在对应的MainActivity.java文件中实现点击切换（fragment的替换或隐藏二种方法如下）**

package com.test.activity;
    
    import com.test.fragment.FragmentA;
    import com.test.fragment.FragmentB;
    import com.test.fragment.FragmentC;
    import com.test.fragment.FragmentD;
    
    import android.app.Activity;
    import android.os.Bundle;
    import android.support.v4.app.Fragment;
    import android.support.v4.app.FragmentActivity;
    import android.support.v4.app.FragmentManager;
    import android.support.v4.app.FragmentTransaction;
    import android.util.Log;
    import android.view.Menu;
    import android.view.MenuItem;
    import android.widget.RadioButton;
    import android.widget.RadioGroup;
    import android.widget.RadioGroup.OnCheckedChangeListener;
    
    public class MainActivity extends FragmentActivity {
        private FragmentA f_a;
        private FragmentB f_b;
        private FragmentC f_c;
        private FragmentD f_d;
        private Fragment[] mFragments;
        private int mIndex;
        private RadioGroup radioGroup;
    	@Override
    	protected void onCreate(Bundle savedInstanceState) {
    		super.onCreate(savedInstanceState);
    		setContentView(R.layout.activity_main);
    		initView();
    		initFragment();//方法一，默认第一fragment
    		//changeFragment(new FragmentA().getFragmentA());//方法二，默认第一fragment
    	}
    
    	  private void initView() {
    		  radioGroup = (RadioGroup)findViewById(R.id.radioGroup);
    		  radioGroup.setOnCheckedChangeListener(new OnCheckedChangeListener() {
    			@Override
    			public void onCheckedChanged(RadioGroup group, int arg1) {
    			       //遍历RadioGroup 里面所有的子控件。
                    for (int index = 0; index < group.getChildCount(); index++) {
                        //获取到指定位置的RadioButton
                        RadioButton rb = (RadioButton)group.getChildAt(index);
                      //如果被选中
                        if (rb.isChecked()) {  
                        	setIndexSelected(index);  
                        	//setIndexSelectedTwo(index);  //方法二
                            break;
                        }
                    }
    				
    			}
    		});
    		
    	}
    	//方法一，默认第一fragment
    	private void initFragment() {
    	        f_a =new FragmentA();
    	        f_b =new FragmentB();
    	        f_c =new FragmentC();
    	        f_d =new FragmentD();
    	        //添加到数组
    	        mFragments = new Fragment[]{f_a,f_b,f_c,f_d};
    	        //开启事务
    	        FragmentManager    fragmentManager = getSupportFragmentManager();
    	        FragmentTransaction ft= fragmentManager.beginTransaction();
    	        //添加首页
    	        ft.add(R.id.content,f_a).commit();
    	        //默认设置为第0个
    	        setIndexSelected(0);
    	    }
    	   //方法一，选中显示与隐藏
    	  private void setIndexSelected(int index) {
    
    	        if(mIndex==index){
    	            return;
    	        }
    	        FragmentManager    fragmentManager = getSupportFragmentManager();
    	        FragmentTransaction ft= fragmentManager.beginTransaction();
    
    	        //隐藏
    	        ft.hide(mFragments[mIndex]);
    	        //判断是否添加
    	        if(!mFragments[index].isAdded()){
    	            ft.add(R.id.content,mFragments[index]).show(mFragments[index]);
    	        }else {
    	            ft.show(mFragments[index]);
    	        }
    
    	        ft.commit();
    	        //再次赋值
    	        mIndex=index;
    
    	    }
    	   //方法二，选中替换
    	  private void setIndexSelectedTwo(int index) {
    		  switch (index) {
    		     case 0:
    		    	 changeFragment(new FragmentA().getFragmentA());
    			    break;
    		     case 1:
    		    	 changeFragment(new FragmentB().getFragmentB());
    			    break;
    		     case 2:
    		    	 changeFragment(new FragmentC().getFragmentC());
    			    break;
    		     case 3:
    		    	 changeFragment(new FragmentD().getFragmentD());
    			    break;
    			  
    
    		default:
    			break;
    		}
    	  }
    	  
    	方法二，默认第一fragment
    	  private void changeFragment(Fragment fm) {  
    	        FragmentManager supportFragmentManager = getSupportFragmentManager();  
    	        FragmentTransaction transaction = supportFragmentManager.beginTransaction();  
    	        transaction.replace(R.id.content, fm);  
    	        transaction.commit();  
    	    }  
    	
    }

**四个相同的Fragment文件，对应的xml就放了一个文本就不贴出来了**

package com.test.fragment;
    
    import com.test.activity.R;
    
    import android.os.Bundle;
    import android.support.v4.app.Fragment;
    import android.view.LayoutInflater;
    import android.view.View;
    import android.view.ViewGroup;
    
    public class FragmentA extends Fragment{
      private View view;
    	// 单例(方法二)
    	private static FragmentA fa;
    	public static FragmentA getFragmentA() {
    		if (fa == null) {
    			fa = new FragmentA();
    		}
    		return fa;
    	}
      @Override
      public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {
    	   view= inflater.inflate(R.layout.fragment_a, container, false);
          return   view;
      }
      
    }

效果图如下:

**![Center][]![Center 1][]**

[Center]: https://img-blog.csdn.net/20170514004840666?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvbGluODU3/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center
[Center 1]: https://img-blog.csdn.net/20170514004855797?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvbGluODU3/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center